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September Weather in Middletown, United States

Last updated: June 24, 2025

In September, the average temperature in Middletown, United States hovers around 19°C (66°F). You can expect a minimum of 3°C (38°F) and the mercury rising to a pleasant 32°C (90°F). With about 100 mm (3.9 in) of precipitation over 9 days, ensure you're prepared for a bit of rain. The average humidity stands at a comfortable 68%, making it a delightful time to explore!

September Temperature in Middletown

In September in Middletown, the average temperature is 19°C (66°F), with maximums reaching up to 32°C (90°F) and minimums dropping as low as 3°C (38°F). This diverse range of temperatures makes it essential for travelers to pack accordingly for both warm days and cool evenings.

September Weather in Middletown: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Middletown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Middletown, September typically has an average temperature of 19°C (66°F), with highs reaching up to 32°C (90°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec293237485968747266554134
Data source: Temperature data for Middletown generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Middletown

In Middletown in September, the precipitation amount is 100 mm (3.9 in) spread over 9 days.

September Precipitation Trends in Middletown

The chart displays monthly precipitation patterns in Middletown, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Middletown, September typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec731019211912510212112610014690104
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Middletown

In Middletown in September humidity is 68%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, creating a sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in Middletown

This chart illustrates the average monthly humidity levels in Middletown, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Middletown is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Middletown

In Middletown in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Middletown.

Maximum UV Index Levels in Middletown for September

The chart shows the monthly maximum UV Index (UVI) for Middletown in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Middletown typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Middletown September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Middletown Compares to Other Months

Weather in Middletown varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Middletown, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Middletown, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (30°F)73 mm (2.9 inches)84%moderate
February Weather0°C (32°F)101 mm (4.0 inches)82%moderate
March Weather3°C (38°F)92 mm (3.6 inches)81%high
April Weather9°C (49°F)119 mm (4.7 inches)78%very high
May Weather15°C (60°F)125 mm (4.9 inches)69%very high
June Weather20°C (68°F)102 mm (4.0 inches)69%very high
July Weather23°C (74°F)121 mm (4.8 inches)62%very high
August Weather22°C (72°F)126 mm (4.9 inches)65%very high
September Weather19°C (66°F)100 mm (3.9 inches)68%very high
October Weather13°C (56°F)145 mm (5.7 inches)74%high
November Weather5°C (41°F)90 mm (3.5 inches)82%moderate
December Weather1°C (34°F)103 mm (4.1 inches)80%low

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